高宽比超限高层建筑模拟地震振动台试验研究

Shaking table test of a high-rise building model with an especial height-width ratio

对一座高宽比超过抗震规范规定的复杂高层建筑进行了模型模拟地震振动台试验研究 .对于一个 1∶30的高层建筑模型 ,通过对其动力特性和动力反应的分析 ,发现短边方向的刚度明显比长方向弱 ,存在长方向的扇形振动 ,即出平面的翘曲变形 ,转换层处的层间相对位移明显大于其他层的位移 ,顶部的鞭梢效应明显 ,此外 ,高振型在加速度反应中作用较大 ,尤其在短边方向上 .针对以上特点 。

One complicated high_rise building with a height_width ratio more than the requirement in the earthquake resistant design code is studied on a shaking table in this paper.For a 1∶30 scale tall building model,the dynamic characteristics and dynamic response of the model are analyzed.It is found that the stiffness in the short direction is less than that in the long direction,and that there is fan shape vibration in the long direction,namely warp deformation out of plane.The drift of transformingf loor is more than that of other floor,the effect of whiplash on the top of building is high.More over,high vibration modes highly affect the acceleration response of building,especially in x direction.Some advice to design the building is given against the feature of the building.